CYTSoft Psychrometric Chart 2.1   
by CYTSoft   

A must have for HVAC & R engineers!
This is an interactive and intelligent psychrometric chart program designed for thermodynamics-related industries, especially HVAC and refrigerating. It helps engineers calculate, analyze, draw, edit, print, and export the conditions and processes of moist air quickly and accurately.
Traditionally, moist air is modeled as a mixture of two ideal gases by most psychrometric charts and calculators. By contrast, CYTSoft Psychrometric Chart gains much higher accuracy and larger extents based on dozens of formulations developed by R. W. Hyland and A. Wexler, in whose reports published by ASHRAE, dry air, water vapor and moist air are all treated as real gases, rather than ideal gases. Thus, this product is especially useful where high precision is required.
It includes a completely customizable chart on which you can draw many kinds of objects (just like CAD). And all these objects are editable. You can insert this chart into other applications easily.
The temperature range is -50 to 200 deg C, or -58 to 392 deg F.